diff --git a/_benchmark/tarai.rb b/_benchmark/tarai.rb
index ff64ad23..f0b99cfd 100644
--- a/_benchmark/tarai.rb
+++ b/_benchmark/tarai.rb
@@ -28,26 +28,31 @@ def tarai(x, y, z) =
 
 system("go version", exception: true)
 
+MAX_BENCH_COUNT = 4
+
 Benchmark.ips do |x|
-  # sequential version
-  x.report("sequential"){ 4.times{ tarai(14, 7, 0) } }
+  # Ruby: sequential version
+  x.report("Ruby: sequential"){ MAX_BENCH_COUNT.times{ tarai(14, 7, 0) } }
 
-  # parallel version (with Ractor)
-  x.report("parallel (Ractor)"){
-    4.times.map do
+  # Ruby: parallel version (with Ractor)
+  x.report("Ruby: Ractor"){
+    MAX_BENCH_COUNT.times.map do
       Ractor.new { tarai(14, 7, 0) }
     end.each(&:take)
   }
 
-  # parallel version (with Fiber)
-  x.report("parallel (Fiber)"){
-    4.times.map do
+  # Ruby: parallel version (with Fiber)
+  x.report("Ruby: Fiber"){
+    MAX_BENCH_COUNT.times.map do
       Fiber.new { tarai(14, 7, 0) }
     end.each(&:resume)
   }
 
-  # parallel version (with goroutine)
-  x.report("parallel (goroutine)"){ Example::Benchmark.tarai_goroutine(14, 7, 0, 4) }
+  # Go: sequential version
+  x.report("Go: sequential"){ MAX_BENCH_COUNT.times{ Example::Benchmark.tarai(14, 7, 0) } }
+
+  # Go: parallel version (with goroutine)
+  x.report("Go: goroutine"){ Example::Benchmark.tarai_goroutine(14, 7, 0, MAX_BENCH_COUNT) }
 
   x.compare!
 end